Oieculae saw



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No. 568,754. Patented 001;. 6, 1896.

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CIRCULAR SAW.

No. 568,754. Patented ont. 6, 1896.

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AUNITED STATES PATENT OFFICE.

AJAOOB E. FOX, OF SEATTLE, WASHINGTON.

CIRCU LAR SAW.

SPECIFICATION forming part f Letters Patent N0. 568,754, dated October 6, 1896. Application tiled February 26, 1896. Serial No. 580,904. (No model.)

To all whom it may concern:

Beit known that l, JACOB E. FOX, a citizen of the United States, residing at Seattle, in the county of King and State of W'ashington, have invented certain new and useful Improvements in Circular Saws; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved form of circular saw, intended more particularly for shingle-sawing, resawing or splitting other lumber, and other similar work.

It consists, essentially, of a very thin saw, which is radially slotted to allow for expansion due tol heating by running and is reinforced and stiffened by circular plates of steel placed upon one or both sides, as may be required by the particular kind of work, which plates are ground to a bevel at their edges.

Figures l and 2 are plan and section of my improved saw as built for use as a shingle-saw. Figs. 3 and 4 are similar views of the saw as adapted to a slitting-saw or resaw.

The saw proper, A, or that part upon which the teeth are formed, is made of very thin steel, being two or three gages thinner than is ordinarily used for the same work. It has a number of radial slots B, extending from the central aperture to near the outer edge, leaving sufficient metal to Jform a solid rim about the saw and connect the different sections. These separated inner segments are all attached by screws b to a steel plate D.I The hole in the center of the saw, as shown in Figs. 1 and 2, is quite large, being large enough to receive the plate C. In a saw for this purpose it is better to keep the saw proper mainly in the form of a comparatively narrow band or zone extending from the outer rim inward. In the drawings this is shown as extending about half-way to the center.

The plate O is centered by fitting tightly over the boss c of the cast-iron head-plate E, which is bolted to the end of the shaft. The boss e centers the plate C, and this in turn centers the saw AI The boss e also centers the stiffening and carrying plate D. The plate O is screwed to the plate D and also to the head-plate E.

In the resaw or slitting-saw, as shown in Figs. 3 and 4, the slots extend to the central hole, but this hole is considerably smaller than in the shingle-saw. In this case there is a stitfening-plate D upon each side and a collar F immediately surrounding the shaft and within the central hole of the saw, which is made slight-ly thicker than the saw, say one gage thicker. This permits clamping the saw rmly between the collars which are usually used for this purpose without binding the inner ends of the saw-segments, thus leaving them free to expand and contract.

The outer edges of thestiffening-plates D in all cases are ground to a sharp edge, so that it will easily enter between the two parts of the board being sawed to separate them. In some cases the outer rim of the saw is also beveled' slight-ly, so that it is thinner at the edge than elsewhere. This results in the production of less sawdust and hence a larger useful product from the same amount of timber. The radial slots allowing free expansion without distortion permits heavier feeding and greater crowding than possible otherwise, and hence results in more work. It prevents distortion and the necessityfor frequent hammering.

In running a saw at high speeds it is under different tension from what it is at low speeds. The friction of the saw upon the wood varies, being greater at or near the rim than at the center. These facts tend to cause asaw which is in balance and true when still to get out of balance and wabble or run untrue when speeded up or when at work. This is cured in my improved saw by the radial slots. The outer solid rim holds the sections together and gives the same continuity of the rim as in an ordinary circular saw. The stresses upon this narrow band would be practically equal at all times, as all parts ot' it are subjected to the same conditions. The inner portions', where the conditions are different, are free to expand by reason of the radial slots. By constructing the beveled stiffening-plates of steel instead of cast-iron they may be made in uch thinner and have the same strength. i

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination of a circular saw hav` ICO ing radial slots extending from near the rim to the central opening with a stiifening-plate fastened to the side thereof, substantially as shown and described.

The combination of a circular savv having a central hole of large diameter and radial slots extending from near the rim to the central hole with a circular plate of the saine thickness as the saw lling the central hole therein, and a stiffening-plate attached to one side of the saT and central plate, substantially as shown and described.

In a circular saw the combination of a head-plate having a central hub or loess7 a stiffening-plate having a central hole to fit said hub, and a circular plate having a central hole to iit the saine hub, with a circular saw having a large opening to iit over the above circular plate and radial slots extending from this central opening to near the rini and means for fastening it to the stii'eningplate7 substantially as shown and described. 4. In a circular saw the combination with the saw having radial slots extending from near the rim to the central opening, a collar within this opening and fitting closely over the central shaft, said collar being a gage thicker than the saw, with a stiitening-plate upon each side of the saw and means for attaching the said stiifening-plates to the saw, substantially as shown and described.

In testimony whereof I affix niy signature in presence of two Witnesses.

JACOB E. FOX.

Titnessesz GEORGE DoNWoRTH, SCOTT CALHOUN. 

